Alice and Bob are strangers. Alice wants Bob to send her a private message A and be able to verify the integrity of the message. What should Bob do? (h() is a hash function and assume both Alice and Bob knows h(). Bob generates an encryption key k and relies on PKI to send Alice X, Y, H where Y=PubE(alice-pub,k), X-SymE(k,A), H=SymE(k,h(A)). This does not work because while Alice can read A, she cannot verify the integrity of the message This does not work because Bob cannot verify the public key of Alice This does not work because Alice cannot recover the encryption key k. This works
Alice and Bob are strangers. Alice wants Bob to send her a private message A and be able to verify the integrity of the message. What should Bob do? (h() is a hash function and assume both Alice and Bob knows h(). Bob generates an encryption key k and relies on PKI to send Alice X, Y, H where Y=PubE(alice-pub,k), X-SymE(k,A), H=SymE(k,h(A)). This does not work because while Alice can read A, she cannot verify the integrity of the message This does not work because Bob cannot verify the public key of Alice This does not work because Alice cannot recover the encryption key k. This works
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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Transcribed Image Text:Alice and Bob are strangers. Alice wants Bob to send
her a private message A and be able to verify the
integrity of the message. What should Bob do? (h() is a
hash function and assume both Alice and Bob knows
h(0). Bob generates an encryption key k and relies on
PKI to send Alice X, Y, H where Y-PubE(alice-pub,k),
X-SymE(k,A), H=SymE(k,h(A)).
This does not work because while Alice can read A,
she cannot verify the integrity of the message
This does not work because Bob cannot verify the
public key of Alice
This does not work because Alice cannot recover
the encryption key k.
This works
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